WO2013079837A1 - Link rod with means of programmed rupture, intended in particular for the connection between the power plant and the cradle of a vehicle - Google Patents

Link rod with means of programmed rupture, intended in particular for the connection between the power plant and the cradle of a vehicle Download PDF

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Publication number
WO2013079837A1
WO2013079837A1 PCT/FR2012/052410 FR2012052410W WO2013079837A1 WO 2013079837 A1 WO2013079837 A1 WO 2013079837A1 FR 2012052410 W FR2012052410 W FR 2012052410W WO 2013079837 A1 WO2013079837 A1 WO 2013079837A1
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WO
WIPO (PCT)
Prior art keywords
cradle
rod
link
vehicle
impact
Prior art date
Application number
PCT/FR2012/052410
Other languages
French (fr)
Inventor
Benoit GOMANNE
Marc Peru
Stephane BOMBARDIER
Original Assignee
Peugeot Citroen Automobiles Sa
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Publication date
Application filed by Peugeot Citroen Automobiles Sa filed Critical Peugeot Citroen Automobiles Sa
Publication of WO2013079837A1 publication Critical patent/WO2013079837A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
    • B60K5/12—Arrangement of engine supports
    • B60K5/1241—Link-type support

Definitions

  • the present invention relates to a connecting link with programmed breaking means, intended in particular but not exclusively to the connection between the powertrain (also referred to as "GMP" in the rest of the text) and the cradle of a vehicle, in particular to a motor vehicle.
  • an anti-torque or anti-tilt rod connects the GMP of a vehicle to the cradle of the vehicle, that is to say the metal support attached to the chassis which has the role of assembling the metal parts such as the tank, the engine, the dampers, etc.
  • This rod can cause poor kinematics of the GMP during a frontal impact (we speak of "verticalization” of the GMP) and disrupt the passage of effort between the GMP and the cradle of the vehicle.
  • WO 2008/000985 discloses a connecting rod between two members movable relative to each other, particularly between the powertrain and the body of a motor vehicle.
  • the rod comprises an elongate body, a first housing for receiving a first shaft, intended to be secured to one of the two members, and a second housing for receiving a second shaft, intended to be secured to the other of the two organs.
  • the rod further comprises programmed breaking means interposed between the two housings, which are adapted to break during the application of a force along a longitudinal axis of the link body, so as to allow the connection between both dwellings.
  • These programmed breaking means comprise a thin skirt, which connects two lateral sides of the body. Indeed, during a shock shifted 40% against a deformable barrier, representative of a vehicle / vehicle collision, the rod must hold and not break in particular face the engine rotation stresses.
  • an object of the present invention is therefore to provide a connecting rod intended for the connection between the GMP and the cradle of a vehicle, which makes it possible to avoid, especially in the event of a frontal impact of the vehicle, a level of excessive deceleration, without this rupture being able to risk intervening during an offset shock.
  • Another object of the present invention is to provide such a programmed breaking means rod to effectively limit the maximum level of deceleration of the vehicle, during the detection of a shock called “wall shock”, which is design and realization simple, safe operation and economical.
  • the subject of the invention is a link rod with programmed breaking means intended in particular for the connection between the GMP and the cradle of a vehicle, which has the shape of an elongated body in the direction of the forces between the GMP and the cradle, said body comprising a first through-hole for receiving an axis of articulation of the link with the GMP and a second through-hole for receiving means for fixing the link to the cradle, characterized in that the means programmed failure comprise pyrotechnic actuation means which, during the detection of a shock called “frontal impact", are triggered and cause the displacement of abutment means or impactor means from an inactive position to an active position in which they abut against the fastening means of the rod on the cradle with an impact intensity suitable for generating the rupture of said fixing means.
  • the programmed breaking means of the link according to the invention make it possible, during the impact of said abutment means, against the fixing means to break the attachment of said link on the cradle and allowing the link to slide freely relative to the cradle which is sufficient to limit the deceleration for 5ms.
  • the rod is fixed on the cradle by means of a fastening screw engaged through an orifice of the cradle and the second through orifice of the link and said stop means or impactor means consist of at least one shear member mounted on the rod drivable moving from the inactive position to the active position under the effect of a pyrotechnic charge placed behind said shear member, the impact of said member of shear causing shearing of the connecting rod of the rod on the cradle and the ejection of said screw.
  • the connecting rod is fixed on the cradle by means of a fastening screw engaged through an orifice of the cradle and the second through-orifice of the link and said abutment means or impactor means are consisting of two impactors such as shear members disposed on the underside of the cradle facing each other on either side of the head of the fixing screw and each associated with a pyrotechnic charge causing their displacement from their inactive position to their active position where the impact force of the two impactors cause tearing of the head of the screw and its ejection out of the link.
  • two impactors such as shear members disposed on the underside of the cradle facing each other on either side of the head of the fixing screw and each associated with a pyrotechnic charge causing their displacement from their inactive position to their active position where the impact force of the two impactors cause tearing of the head of the screw and its ejection out of the link.
  • the rod is housed in a cage fixed on the cradle so that, when the tie rod is broken on the cradle, the cradle thus released can slide in a guided manner in said cage, the wall against which the end of the rod is housed having areas of weakness suitable to allow the rupture of said wall and allow the travel of the link beyond said wall.
  • the pyrotechnic actuation means comprise at least one pyrotechnic charge and means for activating said charge which can be activated by a control box, upon detection, by appropriate detection means, of a level. deceleration of the vehicle corresponding to a frontal shock. Indeed, during an impact, the decision to activate the pyrotechnic actuation means therefore requires Firstly, the detection of a type of shock against rigid wall and the currently used detection technology makes it possible to discriminate a shock against the wall inducing a strong rise of deceleration at the beginning of shock, compared to shocks against deformable obstacles.
  • the detection means comprise two sensors positioned respectively on each side of the front support of the vehicle.
  • the two sensors are activated simultaneously during an impact, this means that we are indeed in the presence of a shock at 100% recovery and, if furthermore the detection means have detected a value important deceleration, it can trigger the pyrotechnic actuating means. If only one of the sensors is activated during an impact, it does not trigger the pyrotechnic actuation means.
  • the information transmitted by the detection means is then managed by a centralized control box which can be the centralized control box airbags, for example, which send to the activation means an order of triggering the pyrotechnic charge.
  • the anti-torque rod according to the invention makes it possible to obtain a good compromise between frontal impact against barrier (in this case it holds) and the impact Wall (0 °) 100% (failure programmed by the pyrotechnic actuation device).
  • the invention makes it possible to effectively limit the maximum level of the vehicle deceleration (order of magnitude: decrease of 10 g) which makes it compatible with the use of conventional means of restraint, and therefore at a limited cost.
  • the present invention also relates to a vehicle, in particular a motor vehicle, which comprises an anti-torque connecting rod between the GMP and the cradle, said anti-torque rod being in accordance with that described above in outline, so that in case of frontal impact of the vehicle, the deceleration is limited by allowing the sliding of the rod on the cradle and thus breaking the passage of efforts between the GMP and the cradle of the vehicle.
  • a vehicle in particular a motor vehicle, which comprises an anti-torque connecting rod between the GMP and the cradle, said anti-torque rod being in accordance with that described above in outline, so that in case of frontal impact of the vehicle, the deceleration is limited by allowing the sliding of the rod on the cradle and thus breaking the passage of efforts between the GMP and the cradle of the vehicle.
  • FIG. 1 is a side perspective view of an anti-torque link according to a first embodiment of the present invention
  • FIG. 2 is a side perspective view of a link according to a second embodiment of the invention.
  • link 1 a lower anti-torque rod, called "link” 1 in the following text, which provides the connection between the GMP 2 and the cradle 3 of a motor vehicle, as described in the following text.
  • the rod 1 has a relatively elongated body shape with a longitudinal axis XX 'with a substantially central reinforced portion designated "core", referenced 30, which carries a first hole 31 for fixing the link 1 on the cradle 3 of the vehicle.
  • the link body is extended by a ring, which carries a second orifice, referenced 32, for the articulation of the link 1 on the GMP 2 of the vehicle.
  • programmed breaking means are provided on link 2 .
  • These programmed breaking means comprise pyrotechnic actuation means 10 in the form of pyrotechnic charges 1 1 and means for activating said charges which, during the detection of a so-called "frontal impact” shock, are triggered and caused the displacement abutment means or impactor means 20 from an inactive position on the rod 2 to an active position in which said impactor means 20 abut against the fastening means of the link 2 on the cradle 3 with an impact intensity of its own to generate the breaking said fixing means.
  • the rod 1 is fixed on the cradle 3 by means of a fixing screw 4 engaged through the cradle 3 which has a hole in correspondence and through the through-hole 31. Furthermore, the end of the rod 1 is engaged in a cage 5 consisting of two side walls 51, an end wall 52 limiting the engagement of the rod 1 and surmounted by an upper wall 53.
  • the abutment means or impactor means 20 here consist of a shearing member 21 mounted on the link 2 so as to have a shearing blade 22 facing the rod 41 of the fixing screw 4.
  • pyrotechnic actuation means consisting of a pyrotechnic charge 1 1 and means for activating said load 1 1.
  • detection means are provided on the vehicle to enable the detection of a shock of the frontal impact type.
  • these detection means comprise means for detecting a large vehicle deceleration in early shock, typical of a frontal impact.
  • this deceleration in the event of a wall shock is of a value twice that measured during an offset shock. It is thus possible to program means for breaking the link when detecting a so-called frontal impact only.
  • the detection means activate the pyrotechnic actuating means 10 which then actuate the shear member 21 to the active position in which its shearing blade 22 causes the rupture of the rod 41 of the fixing screw 4 and detaches the rear axle of the anti-torque rod 1.
  • the latter moves in the cage 5 whose rear wall 52 is provided with zones of weakness (represented by two dotted lines) which allow the rupture of this wall 52 against which the end of the rod 1 abuts in the direction XX ' .
  • the rod 1 once unpinned does not spend more effort between the GMP 2 and the cradle 3 and the deceleration level is thus reduced.
  • the side walls 51 and the upper wall 53 of the cage 5 nevertheless make it possible to guarantee guided sliding of the link 1 relative to the cradle 3.
  • the link rod 1 with programmed breaking means described above has the advantage of limiting the maximum level of deceleration during a frontal impact of the vehicle, under the action of the forces generated on the GMP 2, the link 1 and the cradle 3 of the vehicle by the frontal impact.
  • the abutment means or impactor means are positioned under the cradle 3 at the level of the head 42 of the fixing screw 4. They consist of two impinging members arranged opposite one another. on the other side of the head 42 of the fixing screw 4 and each associated with a pyrotechnic charge 1 1 causing their displacement from their inactive position to their active position against the head 42 of the screw where the force impact of the two impactors cause tearing of the head 42 of the screw and its ejection out of the link 1 along the axis Z. For reasons of clarity, only the loads 1 1 are shown.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Dampers (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

The invention relates to a link rod (1) with means of programmed rupture, intended notably for the connection between the power plant (GMP) (2) and the cradle (3) of a vehicle, which takes the form of a body (30) that is elongate in the direction of load between the power plant (2) and the cradle (3), said body (3) comprising a first through-orifice (32) to accept a pivot about which the link rod (1) is articulated to the power plant (2) and a second through-orifice (31) to accept means (4) of attachment of the link rod (1) to the cradle (3). The invention consists in the fact that the means of programmed rupture comprise pyrotechnic actuating means (10) which, when an impact of the type known as a "frontal impact" is detected, are initiated and cause striker means or impactor means (20) to move from an inactive position into an active position in which they butt against the means (4) of attachment of the link rod (1) to the cradle (3) with an impact intensity capable of causing said means (4) of attachment to rupture.

Description

BIELLETTE DE LIAISON A MOYENS DE RUPTURE PROGRAMMEE, DESTINEE EN PARTICULIER A LA LIAISON ENTRE LE GROUPE MOTOPROPULSEUR ET LE BERCEAU D'UN VEHICULE. La présente invention concerne une biellette de liaison à moyens de rupture programmée, destinée notamment mais non exclusivement à la liaison entre le groupe motopropulseur (désigné aussi « GMP » dans la suite du texte) et le berceau d'un véhicule, en particulier d'un véhicule automobile.  CONNECTING ROD WITH PROGRAMMED BREAKING MEANS, IN PARTICULAR FOR THE CONNECTION BETWEEN THE MOTOR POWERTRAIN AND THE CRADLE OF A VEHICLE. The present invention relates to a connecting link with programmed breaking means, intended in particular but not exclusively to the connection between the powertrain (also referred to as "GMP" in the rest of the text) and the cradle of a vehicle, in particular to a motor vehicle.
De façon classique, une biellette anti-couple ou anti-basculement relie le GMP d'un véhicule au berceau du véhicule, c'est-à-dire au support métallique accroché au châssis qui a pour rôle d'assembler les pièces métalliques telles que le réservoir, le moteur, les amortisseurs, etc.  Conventionally, an anti-torque or anti-tilt rod connects the GMP of a vehicle to the cradle of the vehicle, that is to say the metal support attached to the chassis which has the role of assembling the metal parts such as the tank, the engine, the dampers, etc.
Cette biellette peut engendrer une mauvaise cinématique du GMP lors d'un choc frontal (on parle de « verticalisation » du GMP) et perturber le passage d'effort entre le GMP et le berceau du véhicule.  This rod can cause poor kinematics of the GMP during a frontal impact (we speak of "verticalization" of the GMP) and disrupt the passage of effort between the GMP and the cradle of the vehicle.
Afin d'éviter cette « verticalisation » du GMP par un effet de rotation ou de basculement, de type « saut à la perche », il est nécessaire d'introduire une rupture dans la ligne de transmission d'efforts GMP/biellette/berceau.  In order to avoid this "verticalization" of the GMP by a rotation or tilting effect of the "pole vault" type, it is necessary to introduce a break in the GMP / link / cradle transmission line.
On connaît déjà différents dispositifs permettant une rupture programmée de la liaison entre la biellette anti-couple et le berceau du véhicule.  Various devices are already known for allowing a programmed break in the connection between the anti-torque rod and the cradle of the vehicle.
Ainsi, à titre d'exemple, le document WO 2008/000985 décrit une biellette de liaison entre deux organes mobiles l'un par rapport à l'autre, en particulier entre le groupe motopropulseur et la caisse d'un véhicule automobile. La biellette comprend un corps allongé, un premier logement de réception d'un premier arbre, destiné à être solidarisé avec l'un des deux organes, ainsi qu'un second logement de réception d'un second arbre, destiné à être solidarisé avec l'autre des deux organes. La biellette comprend, de plus, des moyens de rupture programmée, interposés entre les deux logements, qui sont propres à se rompre lors de l'application d'un effort selon un axe longitudinal du corps de biellette, de manière à autoriser le rapprochement entre les deux logements. Ces moyens de rupture programmée comprennent une jupe mince, qui relie deux côtés latéraux du corps. En effet, lors d'un choc décalé 40% contre une barrière déformable, représentatif d'une collision véhicule/véhicule, la biellette doit tenir et ne pas se rompre face notamment aux sollicitations de rotation du moteur. Thus, for example, WO 2008/000985 discloses a connecting rod between two members movable relative to each other, particularly between the powertrain and the body of a motor vehicle. The rod comprises an elongate body, a first housing for receiving a first shaft, intended to be secured to one of the two members, and a second housing for receiving a second shaft, intended to be secured to the other of the two organs. The rod further comprises programmed breaking means interposed between the two housings, which are adapted to break during the application of a force along a longitudinal axis of the link body, so as to allow the connection between both dwellings. These programmed breaking means comprise a thin skirt, which connects two lateral sides of the body. Indeed, during a shock shifted 40% against a deformable barrier, representative of a vehicle / vehicle collision, the rod must hold and not break in particular face the engine rotation stresses.
En revanche, lors d'un choc frontal dit « Mur 0° 100% », cette biellette est nettement plus chargée que dans le cas d'un choc décalé 40% (environ le double) et, de ce fait, la biellette de liaison injecte des efforts dans le berceau et par suite dans le soubassement qui sont trop élevés, induisant un niveau de décélération excessif pour les occupants du véhicule.  On the other hand, during a frontal impact called "Wall 0 ° 100%", this rod is significantly more loaded than in the case of a shifted shock 40% (about double) and, as a result, the connecting rod injects stresses in the cradle and consequently in the underbody which are too high, inducing an excessive level of deceleration for the occupants of the vehicle.
Par conséquent, un but de la présente invention est donc de proposer une biellette de liaison destinée à la liaison entre le GMP et le berceau d'un véhicule, qui permet d'éviter, notamment en cas de choc frontal du véhicule, un niveau de décélération excessif, sans que cette rupture puisse risquer d'intervenir lors d'un choc décalé.  Therefore, an object of the present invention is therefore to provide a connecting rod intended for the connection between the GMP and the cradle of a vehicle, which makes it possible to avoid, especially in the event of a frontal impact of the vehicle, a level of excessive deceleration, without this rupture being able to risk intervening during an offset shock.
Un autre but de la présente invention est de fournir une telle biellette à moyens de rupture programmée pour limiter efficacement le niveau maximal de décélération du véhicule, lors de la détection d'un choc dit « choc mur », qui soit de conception et de réalisation simples, qui soit de fonctionnement sûr et qui soit économique.  Another object of the present invention is to provide such a programmed breaking means rod to effectively limit the maximum level of deceleration of the vehicle, during the detection of a shock called "wall shock", which is design and realization simple, safe operation and economical.
A cet effet, l'invention a pour objet une biellette de liaison à moyens de rupture programmée destinée notamment à la liaison entre le GMP et le berceau d'un véhicule, qui présente la forme d'un corps allongé dans la direction des efforts entre le GMP et le berceau, ledit corps comprenant un premier orifice traversant pour recevoir un axe d'articulation de la biellette avec le GMP et un second orifice traversant pour recevoir des moyens de fixation de la biellette sur le berceau, caractérisé en ce que les moyens de rupture programmée comprennent des moyens d'actionnement pyrotechnique qui, lors de la détection d'un choc dit « choc frontal », sont déclenchés et entraînent le déplacement de moyens de butée ou de moyens impacteurs depuis une position inactive à une position active dans laquelle ils butent contre les moyens de fixation de la biellette sur le berceau avec une intensité d'impact propre à générer la rupture desdits moyens de fixation.  For this purpose, the subject of the invention is a link rod with programmed breaking means intended in particular for the connection between the GMP and the cradle of a vehicle, which has the shape of an elongated body in the direction of the forces between the GMP and the cradle, said body comprising a first through-hole for receiving an axis of articulation of the link with the GMP and a second through-hole for receiving means for fixing the link to the cradle, characterized in that the means programmed failure comprise pyrotechnic actuation means which, during the detection of a shock called "frontal impact", are triggered and cause the displacement of abutment means or impactor means from an inactive position to an active position in which they abut against the fastening means of the rod on the cradle with an impact intensity suitable for generating the rupture of said fixing means.
Ainsi de manière avantageuse, les moyens de rupture programmée de la biellette selon l'invention permettent lors de l'impact desdits moyens de butée contre les moyens de fixation de rompre la fixation de ladite biellette sur le berceau permettant ainsi à la biellette de coulisser librement par rapport au berceau ce qui est suffisant pour limiter la décélération pendant 5ms. Thus, advantageously, the programmed breaking means of the link according to the invention make it possible, during the impact of said abutment means, against the fixing means to break the attachment of said link on the cradle and allowing the link to slide freely relative to the cradle which is sufficient to limit the deceleration for 5ms.
Selon une première forme de réalisation de l'invention, la biellette est fixée sur le berceau à l'aide d'une vis de fixation engagée au travers d'un orifice du berceau et du second orifice traversant de la biellette et lesdits moyens de butée ou moyens impacteurs sont constitués d'au moins un organe de cisaillement monté sur la biellette entraînable en déplacement depuis la position inactive vers la position active sous l'effet d'une charge pyrotechnique placée derrière ledit organe de cisaillement, l'impact dudit organe de cisaillement provoquant la cisaillement de la tige de fixation de la biellette sur le berceau et l'éjection de ladite vis.  According to a first embodiment of the invention, the rod is fixed on the cradle by means of a fastening screw engaged through an orifice of the cradle and the second through orifice of the link and said stop means or impactor means consist of at least one shear member mounted on the rod drivable moving from the inactive position to the active position under the effect of a pyrotechnic charge placed behind said shear member, the impact of said member of shear causing shearing of the connecting rod of the rod on the cradle and the ejection of said screw.
Selon une seconde forme de réalisation, la biellette est fixée sur le berceau à l'aide d'une vis de fixation engagée au travers d'un orifice du berceau et du second orifice traversant de la biellette et lesdits moyens de butée ou moyens impacteurs sont constitués de deux organes impacteurs tels que des organes de cisaillement disposés sur la face du dessous du berceau en regard l'un de l'autre de part et d'autre de la tête de la vis de fixation et associés chacun à une charge pyrotechnique provoquant leur déplacement de leur position inactive à leur position active où la force d'impact des deux impacteurs entraînent l'arrachement de la tête de la vis et son éjection hors de la biellette.  According to a second embodiment, the connecting rod is fixed on the cradle by means of a fastening screw engaged through an orifice of the cradle and the second through-orifice of the link and said abutment means or impactor means are consisting of two impactors such as shear members disposed on the underside of the cradle facing each other on either side of the head of the fixing screw and each associated with a pyrotechnic charge causing their displacement from their inactive position to their active position where the impact force of the two impactors cause tearing of the head of the screw and its ejection out of the link.
De préférence, la biellette est logée dans une cage fixée sur le berceau de sorte que, lors de la rupture de la fixation de la biellette sur le berceau, celle-ci ainsi libérée peut coulisser de manière guidée dans ladite cage, la paroi contre laquelle l'extrémité de la biellette est logée présentant des zones de fragilité propres à permettre la rupture de ladite paroi et autoriser la course de la biellette au-delà de ladite paroi.  Preferably, the rod is housed in a cage fixed on the cradle so that, when the tie rod is broken on the cradle, the cradle thus released can slide in a guided manner in said cage, the wall against which the end of the rod is housed having areas of weakness suitable to allow the rupture of said wall and allow the travel of the link beyond said wall.
De manière avantageuse, les moyens d'actionnement pyrotechniques comprennent au moins une charge pyrotechnique et des moyens d'activation de ladite charge pouvant être activés par un boîtier de commande, lors de la détection, par des moyens de détection appropriés, d'un niveau de décélération du véhicule correspondant à un choc dit frontal. En effet, lors d'un choc, la décision d'activation des moyens d'actionnement pyrotechnique nécessite donc d'abord la détection d'un choc de type contre Mur rigide et la technologie de détection actuellement utilisée permet de discriminer un choc contre Mur induisant une forte montée de décélération en début de choc, par rapport à des chocs contre obstacles déformables. Advantageously, the pyrotechnic actuation means comprise at least one pyrotechnic charge and means for activating said charge which can be activated by a control box, upon detection, by appropriate detection means, of a level. deceleration of the vehicle corresponding to a frontal shock. Indeed, during an impact, the decision to activate the pyrotechnic actuation means therefore requires Firstly, the detection of a type of shock against rigid wall and the currently used detection technology makes it possible to discriminate a shock against the wall inducing a strong rise of deceleration at the beginning of shock, compared to shocks against deformable obstacles.
De manière à améliorer la fiabilité de la détection d'un choc frontal, on prévoit également que les moyens de détection comprennent deux capteurs positionnés respectivement de chaque côté de l'appui façade avant du véhicule. Ainsi, si les deux capteurs sont activés de manière simultanée lors d'un choc, cela signifie qu'on se trouve bien en présence d'un choc à 100% de recouvrement et, si en outre les moyens de détection ont bien détecté une valeur de décélération importante, on peut déclencher les moyens d'actionnement pyrotechniques. Si un seul des capteurs est activé lors d'un choc, on ne déclenche pas les moyens d'actionnement pyrotechniques.  In order to improve the reliability of the detection of a frontal impact, it is also provided that the detection means comprise two sensors positioned respectively on each side of the front support of the vehicle. Thus, if the two sensors are activated simultaneously during an impact, this means that we are indeed in the presence of a shock at 100% recovery and, if furthermore the detection means have detected a value important deceleration, it can trigger the pyrotechnic actuating means. If only one of the sensors is activated during an impact, it does not trigger the pyrotechnic actuation means.
Les informations transmises par les moyens de détection sont alors gérées par un boîtier centralisé de commande qui peut être le boîtier centralisé de commande des airbags, par exemple, qui envoient vers les moyens d'activation un ordre de déclenchement de la charge pyrotechnique.  The information transmitted by the detection means is then managed by a centralized control box which can be the centralized control box airbags, for example, which send to the activation means an order of triggering the pyrotechnic charge.
La biellette anti-couple selon l'invention permet d'obtenir un bon compromis entre choc frontal contre barrière (dans ce cas elle tient) et le choc Mur (0°) 100% (rupture programmée par le dispositif d'actionnement pyrotechnique). L'invention permet de limiter efficacement le niveau maximum de la décélération véhicule (ordre de grandeur : diminution de 10g) ce qui la rend compatible de l'utilisation de moyens de retenue classiques, donc à coût limité.  The anti-torque rod according to the invention makes it possible to obtain a good compromise between frontal impact against barrier (in this case it holds) and the impact Wall (0 °) 100% (failure programmed by the pyrotechnic actuation device). The invention makes it possible to effectively limit the maximum level of the vehicle deceleration (order of magnitude: decrease of 10 g) which makes it compatible with the use of conventional means of restraint, and therefore at a limited cost.
La présente invention a aussi pour objet un véhicule, en particulier un véhicule automobile, qui comporte une biellette anti-couple de liaison entre le GMP et le berceau, ladite biellette anti-couple étant conforme à celle décrite ci- dessus dans ses grandes lignes, de telle sorte qu'en cas de choc frontal du véhicule, on limite la décélération en autorisant le coulissement de la biellette sur le berceau et donc en rompant le passage des efforts entre le GMP et le berceau du véhicule.  The present invention also relates to a vehicle, in particular a motor vehicle, which comprises an anti-torque connecting rod between the GMP and the cradle, said anti-torque rod being in accordance with that described above in outline, so that in case of frontal impact of the vehicle, the deceleration is limited by allowing the sliding of the rod on the cradle and thus breaking the passage of efforts between the GMP and the cradle of the vehicle.
D'autres buts, avantages et caractéristiques de l'invention apparaîtront dans la description qui suit d'un exemple de réalisation, non limitatif de l'objet et de la portée de la présente demande de brevet, accompagnée de dessins dans lesquels : Other objects, advantages and features of the invention will become apparent from the following description of an example of a non-limiting embodiment of the object and of the scope of the present patent application, accompanied by drawings in which:
- la figure 1 est une vue en perspective latérale d'une biellette anti-couple selon un premier mode de réalisation de la présente invention,  FIG. 1 is a side perspective view of an anti-torque link according to a first embodiment of the present invention,
- la figure 2 est une vue en perspective latérale d'une biellette selon un second mode de réalisation de l'invention  FIG. 2 is a side perspective view of a link according to a second embodiment of the invention;
En référence au dessin de la figure 1 , on a représenté une biellette anticouple inférieure, dénommée « biellette » 1 dans la suite du texte, qui assure la liaison entre le GMP 2 et le berceau 3 d'un véhicule automobile, comme exposé dans la suite du texte.  Referring to the drawing of Figure 1, there is shown a lower anti-torque rod, called "link" 1 in the following text, which provides the connection between the GMP 2 and the cradle 3 of a motor vehicle, as described in the following text.
De manière classique, la biellette 1 présente une forme de corps relativement allongé d'axe longitudinal XX' avec une partie sensiblement centrale renforcée désignée « noyau », référencée 30, qui porte un premier orifice 31 pour la fixation de la biellette 1 sur le berceau 3 du véhicule. Le corps de biellette est prolongé par une bague, qui porte un second orifice, référencé 32, pour l'articulation de la biellette 1 sur le GMP 2 du véhicule.  In a conventional manner, the rod 1 has a relatively elongated body shape with a longitudinal axis XX 'with a substantially central reinforced portion designated "core", referenced 30, which carries a first hole 31 for fixing the link 1 on the cradle 3 of the vehicle. The link body is extended by a ring, which carries a second orifice, referenced 32, for the articulation of the link 1 on the GMP 2 of the vehicle.
Conformément au principe de la présente invention, pour limiter le niveau maximal de la décélération véhicule à savoir une diminution d'un ordre de grandeur de 10g, lors d'un choc frontal du véhicule, des moyens de rupture programmée sont prévus sur la biellette 2.  According to the principle of the present invention, in order to limit the maximum level of vehicle deceleration, namely a decrease of an order of magnitude of 10 g, during a frontal collision of the vehicle, programmed breaking means are provided on link 2 .
Ces moyens de rupture programmée comprennent des moyens d'actionnement pyrotechnique 10 sous forme de charges pyrotechniques 1 1 et de moyens d'activation desdites charges qui, lors de la détection d'un choc dit « choc frontal », sont déclenchés et entraînés le déplacement de moyens de butée ou moyens impacteurs 20 depuis une position inactive sur la biellette 2 à une position active dans laquelle lesdits moyens impacteurs 20 butent contre les moyens de fixation de la biellette 2 sur le berceau 3 avec une intensité d'impact propre à générer la rupture desdits moyens de fixation.  These programmed breaking means comprise pyrotechnic actuation means 10 in the form of pyrotechnic charges 1 1 and means for activating said charges which, during the detection of a so-called "frontal impact" shock, are triggered and caused the displacement abutment means or impactor means 20 from an inactive position on the rod 2 to an active position in which said impactor means 20 abut against the fastening means of the link 2 on the cradle 3 with an impact intensity of its own to generate the breaking said fixing means.
Comme cela est visible à la figure 1 , la biellette 1 est fixée sur le berceau 3 à l'aide d'une vis de de fixation 4 engagée au travers du berceau 3 qui présentent un orifice en correspondance et au travers du trou traversant 31 . Par ailleurs, l'extrémité de la biellette 1 est engagée dans une cage 5 constituée de deux parois latérales 51 , d'une paroi d'extrémité 52 limitant l'engagement de la biellette 1 et surmontée d'une paroi supérieure 53. As can be seen in FIG. 1, the rod 1 is fixed on the cradle 3 by means of a fixing screw 4 engaged through the cradle 3 which has a hole in correspondence and through the through-hole 31. Furthermore, the end of the rod 1 is engaged in a cage 5 consisting of two side walls 51, an end wall 52 limiting the engagement of the rod 1 and surmounted by an upper wall 53.
Les moyens de butée ou moyens impacteurs 20 sont ici constitués d'un organe de cisaillement 21 monté sur la biellette 2 de manière à présenter une lame de cisaillement 22 en regard de la tige 41 de la vis de fixation 4. Sur la face opposée de la lame de cisaillement 22 sont placés des moyens de d'actionnement pyrotechnique constitués d'une charge pyrotechnique 1 1 et de moyens d'activation de ladite charge 1 1 .  The abutment means or impactor means 20 here consist of a shearing member 21 mounted on the link 2 so as to have a shearing blade 22 facing the rod 41 of the fixing screw 4. On the opposite face of the shearing blade 22 are placed pyrotechnic actuation means consisting of a pyrotechnic charge 1 1 and means for activating said load 1 1.
En l'absence de choc frontal du véhicule, la biellette 1 est maintenue fixée sur le berceau 3 par l'intermédiaire de la vis 4 dans la cage 5.  In the absence of a frontal impact of the vehicle, the link 1 is held fixed on the cradle 3 by means of the screw 4 in the cage 5.
Par ailleurs, des moyens de détection sont prévus sur le véhicule pour permettre la détection d'un choc de type choc frontal. En particulier, ces moyens de détection comprennent des moyens permettant de détecter une décélération de véhicule importante en début de choc, typique d'un choc frontal. En particulier, cette décélération en cas de choc mur est d'une valeur double de celle mesurée lors d'un choc décalé. On peut ainsi programmer des moyens de rupture de la biellette lors de la détection d'un choc dit frontal uniquement.  In addition, detection means are provided on the vehicle to enable the detection of a shock of the frontal impact type. In particular, these detection means comprise means for detecting a large vehicle deceleration in early shock, typical of a frontal impact. In particular, this deceleration in the event of a wall shock is of a value twice that measured during an offset shock. It is thus possible to program means for breaking the link when detecting a so-called frontal impact only.
Ainsi, lors d'un choc frontal du véhicule, les moyens de détection activent les moyens d'actionnement pyrotechnique 10 qui actionnent alors l'organe de cisaillement 21 vers la position active dans laquelle sa lame de cisaillement 22 provoque la rupture de la tige 41 de la vis de fixation 4 et dégoupille l'axe arrière de la biellette anti-couple 1 . Cette dernière se déplace dans la cage 5 dont la paroi arrière 52 est pourvue de zones de fragilité (représentées par deux lignes en pointillés) qui permettent la rupture de cette paroi 52 contre laquelle l'extrémité de la biellette 1 bute selon la direction XX'.  Thus, during a frontal collision of the vehicle, the detection means activate the pyrotechnic actuating means 10 which then actuate the shear member 21 to the active position in which its shearing blade 22 causes the rupture of the rod 41 of the fixing screw 4 and detaches the rear axle of the anti-torque rod 1. The latter moves in the cage 5 whose rear wall 52 is provided with zones of weakness (represented by two dotted lines) which allow the rupture of this wall 52 against which the end of the rod 1 abuts in the direction XX ' .
Ainsi, la biellette 1 une fois dégoupillée ne passe plus d'effort entre le GMP 2 et le berceau 3 et le niveau de décélération est ainsi diminué. Toutefois, les parois latérales 51 et la paroi supérieure 53 de la cage 5 permettent cependant de garantir un coulissement guidé de la biellette 1 par rapport au berceau 3.  Thus, the rod 1 once unpinned does not spend more effort between the GMP 2 and the cradle 3 and the deceleration level is thus reduced. However, the side walls 51 and the upper wall 53 of the cage 5 nevertheless make it possible to guarantee guided sliding of the link 1 relative to the cradle 3.
La biellette 1 de liaison à moyens de rupture programmée décrite ci- dessus présente l'avantage de limiter le niveau maximal de décélération lors d'un choc frontal du véhicule, sous l'action des efforts engendrés sur le GMP 2, la biellette 1 et le berceau 3 du véhicule par le choc frontal. The link rod 1 with programmed breaking means described above has the advantage of limiting the maximum level of deceleration during a frontal impact of the vehicle, under the action of the forces generated on the GMP 2, the link 1 and the cradle 3 of the vehicle by the frontal impact.
Selon une seconde forme de réalisation de l'invention, les moyens de butée ou moyens impacteurs sont positionnés sous le berceau 3 au niveau de la tête 42 de la vis de fixation 4. Ils sont constitués de deux organes impacteurs disposés en regard l'un de l'autre de part et d'autre de la tête 42 de la vis de fixation 4 et associés chacun à une charge pyrotechnique 1 1 provoquant leur déplacement de leur position inactive à leur position active contre la tête 42 de la vis où la force d'impact des deux impacteurs entraînent l'arrachement de la tête 42 de la vis et son éjection hors de la biellette 1 selon l'axe Z. Pour des raisons de clarté, seules les charges 1 1 sont représentées.  According to a second embodiment of the invention, the abutment means or impactor means are positioned under the cradle 3 at the level of the head 42 of the fixing screw 4. They consist of two impinging members arranged opposite one another. on the other side of the head 42 of the fixing screw 4 and each associated with a pyrotechnic charge 1 1 causing their displacement from their inactive position to their active position against the head 42 of the screw where the force impact of the two impactors cause tearing of the head 42 of the screw and its ejection out of the link 1 along the axis Z. For reasons of clarity, only the loads 1 1 are shown.

Claims

REVENDICATIONS
1 . Biellette de liaison (1 ) à moyens de rupture programmée, destinée notamment à la liaison entre le groupe motopropulseur (GMP) (2) et le berceau (3) d'un véhicule, qui présente la forme d'un corps allongé (30) dans la direction des efforts entre le GMP (2) et le berceau (3), ledit corps (30) comprenant un premier orifice traversant (32) pour recevoir un axe d'articulation de la biellette (1 ) avec le GMP (2) et un second orifice traversant (31 ) pour recevoir des moyens de fixation (4) de la biellette (1 ) sur le berceau (3), caractérisé en ce que les moyens de rupture programmée comprennent des moyens d'actionnement pyrotechnique (10) qui, lors de la détection d'un choc dit « choc frontal », sont déclenchés et entraînent le déplacement de moyens de butée ou de moyens impacteurs (20) d'une position inactive à une position active dans laquelle ils butent contre les moyens de fixation (4) de la biellette (1 ) sur le berceau (3) avec une intensité d'impact propre à générer la rupture desdits moyens de fixation (4). 1. Tie rod (1) with programmed breaking means, intended in particular for the connection between the power train (GMP) (2) and the cradle (3) of a vehicle, which has the shape of an elongated body (30) in the direction of the forces between the GMP (2) and the cradle (3), said body (30) comprising a first through hole (32) for receiving a hinge axis of the link (1) with the GMP (2) and a second through hole (31) for receiving fastening means (4) of the link (1) on the cradle (3), characterized in that the programmed breaking means comprise pyrotechnic actuating means (10) which , during the detection of a so-called "frontal impact" shock, are triggered and cause the displacement of abutment means or impactor means (20) from an inactive position to an active position in which they abut against the fixing means (4) of the link (1) on the cradle (3) with an impact intensity specific to g erate breaking said attachment means (4).
2. Biellette (1 ) selon la revendication 1 , caractérisée en ce que la biellette (1 ) est fixée sur le berceau (3) à l'aide d'une vis de fixation (4) engagée au travers d'un orifice du berceau (3) et du second orifice traversant (31 ) de la biellette (1 ) et lesdits moyens de butée ou moyens impacteurs (20) sont constitués d'au moins un organe de cisaillement (22) monté sur la biellette (1 ) entraînable en déplacement depuis la position inactive vers la position active sous l'effet d'une charge pyrotechnique (1 1 ) placée derrière ledit organe de cisaillement (22), l'impact dudit organe de cisaillement (22) provoquant la cisaillement de la tige (41 ) de la vis de fixation (4) de la biellette (1 ) sur le berceau (3) et l'éjection de ladite vis (4).  2. Rod (1) according to claim 1, characterized in that the link (1) is fixed on the cradle (3) with a fastening screw (4) engaged through a hole of the cradle (3) and the second through hole (31) of the rod (1) and said abutment means or impactor means (20) consist of at least one shear member (22) mounted on the rod (1) drivable in moving from the inactive position to the active position under the effect of a pyrotechnic charge (1 1) placed behind said shear member (22), the impact of said shear member (22) causing shearing of the rod (41); ) of the fixing screw (4) of the link (1) on the cradle (3) and the ejection of said screw (4).
3. Biellette (1 ) selon la revendication 1 , caractérisée en ce que la biellette (1 ) est fixée sur le berceau (3) à l'aide d'une vis de fixation (4) engagée au travers d'un orifice du berceau (3) et du second orifice traversant (31 ) de la biellette (1 ) et lesdits moyens de butée ou moyens impacteurs (20) sont constitués de deux organes impacteurs tels que des organes de cisaillement disposés sur la face du berceau (3) opposée à la face du berceau (3) sur laquelle repose la biellette (1 ), lesdits organes impacteurs (20) étant en regard l'un de l'autre, de part et d'autre de la tête (42) de la vis de fixation (4) et associés chacun à une charge pyrotechnique (1 1 ) provoquant leur déplacement de leur position inactive à leur position active où la force d'impact des deux organes impacteurs (20) entraînent l'arrachement de la tête (42) de la vis (4) et son éjection hors de la biellette (1 ). 3. Rod (1) according to claim 1, characterized in that the rod (1) is fixed on the cradle (3) with a fastening screw (4) engaged through a hole of the cradle (3) and the second through hole (31) of the rod (1) and said abutment means or impactor means (20) consist of two impinging members such as shear members disposed on the face of the cradle (3) opposite at the face of the cradle (3) on which the link (1) rests, said impact members (20) facing each other, on either side of the head (42) of the screw fastening (4) and each associated with a load pyrotechnic (1 1) causing their displacement from their inactive position to their active position where the impact force of the two impactor members (20) causes the head (42) of the screw (4) to tear and eject the link (1).
4. Biellette (1 ) selon l'une des revendications 1 à 3, caractérisée en ce que la biellette (1 ) est logée dans une cage (5) fixée sur le berceau (3) de sorte que, lors de la rupture de la fixation de la biellette (1 ) sur le berceau (3), celle-ci ainsi libérée peut coulisser sur le berceau (3) de manière guidée dans ladite cage (5), la paroi (52) contre laquelle l'extrémité de la biellette (1 ) est logée présentant des zones de fragilité propres à permettre la rupture de ladite paroi (52) et autoriser la course guidée de la biellette (1 ) au-delà de ladite paroi (52).  4. Rod (1) according to one of claims 1 to 3, characterized in that the rod (1) is housed in a cage (5) fixed on the cradle (3) so that, when breaking the fixing the link (1) on the cradle (3), the latter and released can slide on the cradle (3) guided in said cage (5), the wall (52) against which the end of the rod (1) is housed with areas of weakness suitable to allow the rupture of said wall (52) and allow the guided stroke of the link (1) beyond said wall (52).
5. Biellette (1 ) selon l'une des revendications 1 à 4, caractérisée en ce que les moyens d'actionnement pyrotechnique (10) comprennent au moins une charge pyrotechnique (1 1 ) et des moyens d'activation pouvant être activés par un boîtier de commande lors de la détection par des moyens de détection appropriés d'un niveau de décélération du véhicule correspondant à un choc dit frontal.  5. link (1) according to one of claims 1 to 4, characterized in that the pyrotechnic actuating means (10) comprise at least one pyrotechnic charge (1 1) and activation means that can be activated by a control unit when detection by appropriate detection means of a deceleration level of the vehicle corresponding to a so-called frontal shock.
6. Biellette (1 ) selon la revendication 5, caractérisée en ce que les moyens de détection comprennent également deux capteurs positionnés respectivement de chaque côté de l'appui façade avant du véhicule.  6. Rod (1) according to claim 5, characterized in that the detection means also comprise two sensors positioned respectively on each side of the front facade support of the vehicle.
7. Véhicule, en particulier véhicule automobile, qui comporte une biellette anti-couple (1 ) de liaison entre le GMP (2) et le berceau (1 ), caractérisé en ce que ladite biellette anti-couple est conforme à l'une quelconque des revendications 1 à 6, de telle sorte qu'est limité, en cas de choc frontal du véhicule, le niveau de décélération en rompant la fixation de la biellette (1 ) sur le berceau (3) ce qui rompt le passage des efforts entre le GMP (2) et le berceau (3) du véhicule.  7. Vehicle, in particular a motor vehicle, which comprises an anti-torque link (1) connecting the GMP (2) and the cradle (1), characterized in that said anti-torque rod is in accordance with any one of claims 1 to 6, so that is limited, in the event of a frontal impact of the vehicle, the deceleration level by breaking the attachment of the rod (1) on the cradle (3) which breaks the passage of efforts between the GMP (2) and the cradle (3) of the vehicle.
PCT/FR2012/052410 2011-11-30 2012-10-22 Link rod with means of programmed rupture, intended in particular for the connection between the power plant and the cradle of a vehicle WO2013079837A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1160996 2011-11-30
FR1160996A FR2983271B1 (en) 2011-11-30 2011-11-30 CONNECTING ROD WITH PROGRAMMED RUPTURE MEANS, IN PARTICULAR FOR THE CONNECTION BETWEEN THE MOTOR POWERTRAIN AND THE CRADLE OF A VEHICLE

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CN105377604A (en) * 2013-07-11 2016-03-02 标致·雪铁龙汽车公司 Motor vehicle comprising two portions connected to one another by programmed-rupture connecting member

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US5740876A (en) * 1991-06-24 1998-04-21 Nissan Motor Co., Ltd. Power plant support device for a vehicle
DE10328170A1 (en) * 2003-06-24 2005-01-13 Daimlerchrysler Ag Safety engine cover for road vehicle deforms if vehicle hits pedestrian, with given clearance between top of engine and underside of engine cover and engine may be driven downward on flexible mounting
DE10354639A1 (en) * 2003-11-22 2005-08-04 Bayerische Motoren Werke Ag Aggregate fastening mechanism for motor vehicle, has drive unit lowered opposite to body and carriage under front hood, and control device connected parallel to vertical axis of vehicle, where buffer zone is provided for hood deformation
WO2008000985A1 (en) 2006-06-30 2008-01-03 Peugeot Citroën Automobiles SA Link rod providing the connection between two moving parts and corresponding motor vehicle
JP2009067065A (en) * 2007-09-10 2009-04-02 Daikin Ind Ltd Power unit mounting structure
CN101875404A (en) * 2009-12-17 2010-11-03 北京理工大学 Sealed small low-impact release screw bolt

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Publication number Priority date Publication date Assignee Title
US5740876A (en) * 1991-06-24 1998-04-21 Nissan Motor Co., Ltd. Power plant support device for a vehicle
DE10328170A1 (en) * 2003-06-24 2005-01-13 Daimlerchrysler Ag Safety engine cover for road vehicle deforms if vehicle hits pedestrian, with given clearance between top of engine and underside of engine cover and engine may be driven downward on flexible mounting
DE10354639A1 (en) * 2003-11-22 2005-08-04 Bayerische Motoren Werke Ag Aggregate fastening mechanism for motor vehicle, has drive unit lowered opposite to body and carriage under front hood, and control device connected parallel to vertical axis of vehicle, where buffer zone is provided for hood deformation
WO2008000985A1 (en) 2006-06-30 2008-01-03 Peugeot Citroën Automobiles SA Link rod providing the connection between two moving parts and corresponding motor vehicle
JP2009067065A (en) * 2007-09-10 2009-04-02 Daikin Ind Ltd Power unit mounting structure
CN101875404A (en) * 2009-12-17 2010-11-03 北京理工大学 Sealed small low-impact release screw bolt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105377604A (en) * 2013-07-11 2016-03-02 标致·雪铁龙汽车公司 Motor vehicle comprising two portions connected to one another by programmed-rupture connecting member

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FR2983271B1 (en) 2014-01-10

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